Process of extracting grease.



No. 705,034. Patented July 22, I902.

D. CAMERON.

PROCESS OF EXTRAGTING GREASE.

(Application filed Feb. 10, 1902.)

(No Model.)

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A INITED STATES PATENT OFFICE.

DANIEL CAMERON, OF KANSAS CITY, MISSOURI, ASSIGNOR TO CUDAI-IY PACKINGCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PROCESS OF EXTRACTING GREASE.

SPECIFICATION forming part of Letters Patent No. 705,034,

Application filed February 10,1902.

To all 1072 0722, it may concern.-

Be itknown that LDANIEL CAMERON, a citizen of the United States,residing at Kansas City, in the county of Jackson and State of Missouri,have invented a certain new and useful Improvement in Processes ofExtracting Grease, (Case No. 2,) of which the following is a full,clear, concise, and exact description,reforence being had to theaccompanying drawing, forming a part of this specification.

My invention relates to methods for treating grease or oil carryingproducts, and has for its object the provision of an improved methodwhereby it is possible to readily extract oil or grease from wastematerials-for instance, hog or cattle products or any ordinary form ofgrease-carrying product which contains oil or grease.

I have found that it is advisable in extracting oils or greases fromproducts containing the same to subdivide the same, after which pressuremay be exerted upon the subdivided material to remove the oil or greasetherefrom.

Myinvention contemplates in the preferred embodimentthereof an improvedand greatlysimplified method whereby the subdivision of the product issimplified and aided, after which subdivision the material is broughtwithin the influenceof a pressure apparatus or separator,in whichsuitable means are employed to agitate the contents thereof. thepressure has been sufficiently applied, which according to my improvedmethod is preferably done through the agency of steam, oil which hascollected in the apparatus may be Withdrawn and more thoroughlypurified, if desired, after which the residue is removed into a drier,to which heat may be supplied and from which air may be exhausted tofacilitate this drying process.

The apparatus used in carrying out my improved method provides agreatly-simplified rendering apparatus requiring very little attentionand extracting the oil in a most thorough and ei'licient manner and atthe same time reducing the waste material to a dry pulverizedsubstance,all of which operations may be carried on without creatingtoo-ofiensive odors.

After dated July 22,1 902.

Serial No. 98,421. (No specimens.)

I will describe an improved apparatus which may be employed in carryingout the method of my invention, in connection with the accompanyingdrawing, illustrating the preferred embodiment of said application.

The apparatus, as shown in the drawing, by means of which I carry outthe method of my invention comprises a hopper 1, into which the productswhich are to be operated upon by the machine may be deposited. Thematerials when deposited in the hopper are subjected to heat, which issupplied thereto by a coil of steam-piping 2. This heating of thegrease-carrying product aids the grinding process, to which, inaccordance with my improved method, I subject the material before thesame is treated in the pressure-chamber or separator. After a sufficientheating of the grease-carrying products within the hopper 1 a valve 3may be opened to admit the same into a grinder 4 of any suitableconstruction, Within which the products are sub-- divided and passedtherefrom by the chute 5 into the pressure-chamber or separator 6. Asuitable manhole is provided in the upper portion of the separator 6,which is closed by a lid '7, suitable means-such,for instance, as

alocking-bar 8-being employed to retain the lid in place against thepressure which is exerted within the separator.

After the process of heating and grinding, to which the products havebeen subjected in their passage through the hopper 1 and the grinder at,the products are subjected to heat and pressure to have-the oilsextracted therefrom in a most thorough and efficient manner. I extractthe oil from the grease-carrying products deposited in the separator bysubjecting them to a pressure, which is done through the agency of steamadmitted to the interior of the separator by a coil of steampipe 9, towhich steam may be supplied from any suitable source. The heat andpressure exerted upon the product extract the oil therefrom and allowthe same to gather in the separator. The steam-pipe 9 is provided aboutfive hours, the steam serving in the dual capacity of heating thematerial and at the same time subjecting the same to pressure, wherebythe oils are most efficiently extracted from the product within theseparator. In order to more thoroughly extract the oil, means areemployed to agitate the contents, which means preferably consist of acentrallylocated rotary shaft 10, driven by means of a belt 11 in asuitable manner. The central shaft is provided with arms 12 12, securedthereto, which I arrange in spiral fashion about the said shaft, as wellillustrated in the drawing, so that a most thorough agitation of thematerial is secured.

I am enabled to secure the extraction of the oil from the products inthe separator at a much-reduced temperature and under more favorableconditions and in less space than by methods heretofore used, as saidmaterial is supplied to the separator in a finely-subdividedpartly-heated condition, in which condition it is readily susceptible tothe action of the steam under pressure as supplied to the separator.

The oil is carried away from the separator by means of eduction-tubes 1313, which are all united with a common conveying-pipe 14:. Theeduction-tubes 13 are placed in communication with the conveying-pipe 14by valves 15 15, placed in said eduction tubes, so that either one ofsaid eduction-tubes 13 may, as desired,con vey the oil or grease fromthe separator.

The advantage of eduction-tubes placed at different heights is that bythis means oil can be drawn off without the necessity of admitting waterto float the oil up to a single outlet. In the rendering process thereis a certain amount of sediment in the separator. This is calledtankage,and consists of refuse, which rests upon the bottom of theseparator. Above this is the oil, the lighter and purer oil being at thetop. The oil becomes heavier as the tankage is approached until finallyjust above the tankage there is a heavy black oil, which has to besubjected to retreatment for removing impurities. Heretofore the oil hasbeen led out by means of an outlet, and as the amount of the tankage andthe black oil in a charge varies it has been necessary to admit'water toraise the oil to the outlet, the outlet being high enough to be abovethe tankage and black oil in any case. The admission of the water servedto agitate the contents, which prolonged the operation of settling. Thewater also had to be removed from the refuse by the final process ofdrying.

By means of the different outlets with their valves I am able to leadout the lighter and purer oil without disturbing or drawing the blackoil or tankage, and I thus save time and trouble of admitting water andthe agi tation of the contents resulting therefrom, and I also avoid thenecessity of extracting the water again from the refuse after it ispassed to the drier.

It is not necessary in carrying out the improved method of my inventionto withdraw gases, steam, or volatile matter from the separator, but theoil therefrom may be withdrawn as it condenses by the eduction-tubes 18,the whole material being allowed to condense, if desired, within saidseparator 6.

The oils as withdrawn from the separator 6 may be deposited selectivelyin two tanks 16 and 17, one of which may serve as a receiver for thepure light oils as Withdrawn by means of the upper eduction-tubes 13 andthe other of which may serve as a receptacle for the grease withdrawnfrom the separator by the lower eduction-tubes.

After substantially all of the oils or grease have been withdrawn fromthe product within the receiver 6 the residue is admitted into a drier18 through a pipe 19, provided with a suitable valve 20.

The amount of material which may be acted upon at one time may be quitelarge, as the size of the separator may be almost anything desired, aseparator which I have in practical operation and from which thedrawingin the present application has been prepared being sixteen feet inheight.

The drier 18, which receives the residue from the separator 6, issuitably steam-jacketed, inlet and outlet tubes 21 22 for admit ting andwithdrawing steam from the steamjacket being indicated. Thesteam-jacket, to which steam may be supplied at a suitable pressure,sixty pounds being a fair value, serves to dry the material.

In order to aid the drying action in the steam-jacket, I provide meansfor exhausting the air from the interior of the drier 18, which meansconsist of a suitable air or vacuum pump 23, united with the pipe 19 bya tube 24, having a valve 25 therein. The drying action may be carriedon until the material is sufficiently dried, during which time thematerial in the drier is agitated by fan-blades 26 26, spirally arrangedabout a central rotatable shaft 27, driven in any suitable manner, as bya belt 28. The material, by virtue of the agitation to which it issubjected, is pulverized to a large degree and may be withdrawn from theseparator through a manhole 29, provided with a lid 30, which is placedat the bottom of said drier.

In order to permit the gases to be blown off from the separator, Iprovide an exit-tube 32, having a valve 38, which may be led to somesuitable condensing apparatus, if desired, as is well understood.

The great advantage of treating products by my improved method will bereadily apparent to those skilled in the art. The prod ucts may beoperated upon at a reduced tem perature and'under more favorableconditions than has hitherto been possible. The apparatus which isrequired to perform all of the operations upon the grease-carryingproduct is reduced to a minimum and greatly simplified and occupies lessspace.

The apparatus herein disclosed I have made the subject-matter of myapplication, No. 93,420, filed February 10, 1902.

While Ihaveherein shown and particularly described the preferred methodof carrying out my invention, I do not wish to limit myself to theprecise construction and arrangement of apparatus herein set forth; but,

Having thus described my invention, I claim as new, and desire to secureby Letters Patent, the following:

'1. The herein-described method of extracting oil from oil-bearingproducts containing a substantial quantity of non-oleaginous material,which consists in heating said oil-bearing products, thereafter passingthe same througha grinder, where they are subdivided, then passing theproducts into aseparator and subjecting them to heat and pressure,whereby the oils and grease are separated from the residue, withdrawingthe lighter oil without adding water to the contents of the separator,and thereafter subjecting the residue to heat in a vacuum to dry thesame, substantially as described.

2. The herein-described process of treating oil or grease carryingproducts containing a substantial quantity of non-oleaginous material,which consists in heating said products, then passing the same through agrinder to subdivide the same,thereafter subjecting said products toheat under pressure in a closed receptacle while agitating saidproducts, thereby to separate the oil or grease from the residue,allowing the oil to rise and then Withdrawing the same without addingwater to the product, and thereafter subjecting the residue to heat in aclosed receptacle, thereby to dry the same, substantially as described.

In Witness whereof I hereunto subscribe my name this 5th day ofFebruary, A. Dr 1902.

DANIEL CAMERON.

Witnesses: v

CHARLES A. BROWN, HARVEY L. HANSON.

